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Omar Sandoval 21035965f6 bitmap: fix memset optimization on big-endian systems 
Commit 2a98dc028f ("include/linux/bitmap.h: turn bitmap_set and
bitmap_clear into memset when possible") introduced an optimization to
bitmap_{set,clear}() which uses memset() when the start and length are
constants aligned to a byte.

This is wrong on big-endian systems; our bitmaps are arrays of unsigned
long, so bit n is not at byte n / 8 in memory.  This was caught by the
Btrfs selftests, but the bitmap selftests also fail when run on a
big-endian machine.

We can still use memset if the start and length are aligned to an
unsigned long, so do that on big-endian.  The same problem applies to
the memcmp in bitmap_equal(), so fix it there, too.

Fixes: 2a98dc028f ("include/linux/bitmap.h: turn bitmap_set and bitmap_clear into memset when possible")
Fixes: 2c6deb0152 ("bitmap: use memcmp optimisation in more situations")
Cc: stable@kernel.org
Reported-by: "Erhard F." <erhard_f@mailbox.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-04-02 20:52:27 -07:00
arch arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
block treewide: simplify Kconfig dependencies for removed archs 2018-03-26 15:55:57 +02:00
certs certs/blacklist_nohashes.c: fix const confusion in certs blacklist 2018-02-21 15:35:43 -08:00
crypto mn10300: Remove the architecture 2018-03-09 23:19:56 +01:00
Documentation arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
drivers arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
include bitmap: fix memset optimization on big-endian systems 2018-04-02 20:52:27 -07:00
init arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
ipc ipc/shm.c: add split function to shm_vm_ops 2018-03-28 13:42:05 -10:00
kernel arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
lib arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
LICENSES LICENSES: Add MPL-1.1 license 2018-01-06 10:59:44 -07:00
mm arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
net Kbuild fixes for v4.16 (3rd) 2018-03-30 18:53:57 -10:00
samples arch: remove tile port 2018-03-16 10:56:03 +01:00
scripts arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
security integrity/security: fix digsig.c build error with header file 2018-02-22 20:09:08 -08:00
sound main drm pull request for v4.17 2018-04-02 07:59:23 -07:00
tools arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
usr initramfs: fix initramfs rebuilds w/ compression after disabling 2017-11-03 07:39:19 -07:00
virt kvm/arm fixes for 4.16, take 2 2018-03-15 21:45:37 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore .gitignore: ignore ASN.1 auto generated files 2018-02-14 21:05:38 +01:00
.mailmap mailmap: Update email address for Gregory CLEMENT 2018-03-09 17:48:50 +01:00
COPYING
CREDITS MAINTAINERS/CREDITS: Drop METAG ARCHITECTURE 2018-03-05 16:34:24 +00:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
Makefile arch: remove obsolete architecture ports 2018-04-02 20:20:12 -07:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.